Collapsible core



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2 SHEETS- Patented J une 17 LSOXS.

. WEBB.

R. M COLLAPSIBLE CORE. APPLICATION FILED OCT. I4, I9I8.

Patented June VI, LI I 2 SHEETS-SHEET w @IN *fw/ems persas cu., mmrrumw wAsm/vcrou. L.. M

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ROBIN MONROE WEBB, OF BESSEIVIEB., ALABAMA.

COLLAPSIBLE CORE.

Specification of Letters Patent.

Patented June 1"?, 1919.

Application led October 14, 1918. Serial No. 258,006.

To all whom it may concern:

Be it known that l, ROBIN M. WEBB, a

`citizen of the United States, residing at `collapsible cores such as those used in formmir ing castV piping, and the object of the device is to provide a comparatively simple and inexpensive, yet a highly ellicient and durable core which may be collapsed or contracted after the pipe is cast, so that it may be removed for further use.

With the foregoing object in view, the invention resides in the novel features of-construction and unique arrangement of parts hereinafter fully described and claimed, reference being made to the accompanying drawings which form a part of this-application. Y

Figure 1 of the drawings is a longitudinal section showing the core in operative position.

Fig. 2 is a transverse section on the plane of the line 2.-2 of Fi'g. 1 and indicating the line upon which Fig. 1 is cut.

Fig; 3 is a transverse section on the plane of the line 3-3 of Fig. 1.

Fig. 4 isa longitudinal the core collapsed and withdrawn from Vthe pipe.

Fig. 5 is a transverse section bythe line 5*-5 `of Fig. 4.` v l Fig. 6 is an innervside elevation of one of the longitudinal bars forming the core wall. F'gs. 7 and 8 are end elevations of the bar shown inv Fig. 6.

K Fig. 9 is an inner side elevation ofanother of the bars employed.

i Figs. 10 and 11 are end elevations of the bar shown in Fig. 9.

. Fig. 12 is an enlarged detail'section.

In the drawings above briefly described, the ,numerals 1 and 1a desi ate a plurality of longitudinal bars of which the core wall is` constructed, the alternate bars 1n over# lapping the intervening bars 1 as shown clearlyin: Fi'.l 2, and 5.1 The outer sides' section showing as indicated in the act of being hub 15, while it passes all of the bars are shaped according to the ,contour to be imparted to the completed i pipe and in most cases, the core formed by the several bars will be cylindrical. All of the bars 1 and 1a are reinforced by longitudinal ribs 2 and by transverse ribs 2a.

At one end, the bars 1 and 1a are provided with circumferential grooves 3 preferably of the V-shape shown in Figs. 1 and 4, said grooves receiving therein a cam flange 4 projecting laterally from a circular head 5, the peripheral edge of said head being beveled at 6' for engagement with a beveled seat ring 7 The ends of the bars 1 and 1a opposite the grooves 3, are increased in thickness at S and provided with oblique sockets 9 and 9a which slidably receive oblique cams 10 and Y 1()a on a second head 11, it being intended that when the two heads 5 and 11 are drawn toward eachother to the position seen in Fig. 1, they shall expand the core to the maximum, by engagement of the cams with the walls of the sockets, and by the coaction of the cam flange 4 with the walls of the grooves 3. Similarly, when the heads are moved outwardly away from each other, the core is contracted, and during this contracting movement, it is necessary that the bars 1 shall move inwardly more rapidly than the bars 1a. To obtain this result, the cams 10 operating withinv the sockets 9 of the bars 1, are disposed at a greater angle to the core axis than the cams I10a` which operate within the sockets 9a ofthe bars 1a, as indicatedY by the lines 12 of Fig. 1. The expanding of one end of the core is limited by the seating of flange 4 in the bottom of the grooves 3, and in order to prevent ex-` cessive expansion of the other end of said core, a ring 13 preferably surrounds the same as shown.

The heads 5 yand 11 arej provided with hubs 14 and 15 respectively andwa centrall rod 16 passes through said hubs, said rod being pinned or otherwise secured at 6 to the slidably I.through lthe hub 14. Rod 16 is provided' with a slot 17 for registration with other slots -18 in the hub 14 to receive a wedge 19, whereby tow draw the twoheads 5 `and 11 inwardly to'A4 operative position. When this Wedge: is remove however the core is permitted, to @entra-@t in manner te' be hereinafter rfully' explained. 'To limit the outward movement of the heads 5 and 11, a pin20 preferably passes through the hub 14 and through a slot 21 in the rod 16. The rod is provided, o at a point spaced outwardly from the hub 15, with an opening 22 adapted tolreceive'a suitable pulling device, whereby said rod` may be so shifted as to Collapse the core when required.

In operation, the mold is positioned'as seen in Fig. 2 and a coating 23 of loam 1s placedl around said core, after which the pipe 2a is cast. When the pipe hashardened sufficiently, the' wedge 19 is withdrawn and by engaging any suitable means withthe opening 22, the rod 16 is pulled forwardly so that the cams and 10a move into lthe sockets: 9 and 9 respectively, thus swinging the outer ends of the'bai's 1 and '1L inwardly away from' theloam and the complete pipef A further pull on the rod will now slide the bars 1y and' 1u awayI from the head' 5 until theiend of slot 21 strikes the 'pin 20 as 'shownt in Fig. 4, an'd when this takes place, the entire core is bodily removed.'y It is kto be observedthat the relation of the pin 20 and slot"21.`is such as to prevent entire'fremoval oftheilange 4 from the grooves'3, thus obviat'ing the necessty of'reassembling thecore after 'withdrawal thereof.

By referenceftofFig. 12,"it will be' seen that the points lX` of the bars lare spaced toward the 'opposite end `of the bars' from lthe centers R. Itis aroiindthe'se centers that the"bottoms of the grooves 3 and the edge 'off the-flange 4 are eurved.` By ythis relativeloc'ation of the points 'Xand R, the former' inove inwardlyfromthe pipe`2ll when" the opposite ends ofl the bars 1 are swung inwardly, thus interfering in no' manner with the vcompleted pipe "and allowing ealsy'removal of the core. i

Fronifthe foregoing",` taken `in connection with the accompanying drawings, lit will be seen' thatl althoiigh "myy invention is ofcomparatively simple and "inexpensive nature, it' will be highly eiieient'durable and in every way desirable;V Since Yprobably the 'best results are obtained 'from the'det'ails shown and described, they are by preference followed, but witliinth'e scope? ofthe invention as claimed, considerablelatitude is allowed for making suoli changes' 'as oe'casion may dictate.

I Claim: i

1. A hollow Collapsible :cI-'ore' comprising a plurality of longitudinal hars, 'heads at the ends" of said bars for* shiftingthemfradiidly to expaiidand contract theeore,and'means for drawing said4 eac'h other to lexpand the 'core'ai'idffor limit` ing thel movementof saidhe'adsV away from each' other: 65.' A2.l A hollow collapsible-Core comprising a heads inwardlyI l'toward 4'plurality of longitudinalbars, heads at the ends of said bars :t'orshifting them radially to expand and contract the core, a rod secured to one headand passing slidably through the other head, means engaging said rod and said last named head for drawing the two heads toward each `other to expand the u core, and means associated with said rod for limiting the movement of said heads awayromeaeh other.

3. A hollow collapsible core comprising a pluralitylot longitudinal'bars, heads at the endsiof. said barsfor shiftingthein'radially to -expand and'eontract the core,arod se- `cured"`to`f4 one head and passing 'slidably through theother'head, 'said rod having 'a slotfa wedge for reception in said slotci and engagement AwithsaidlastE named head to draw the two'heads toward 'each other and expandthe core, and' means associated with lsaid rod for lin'iiting'the movement of said heads away from each other.

4. Aholl'otvcollap'sille core' comprising a plurality of longitudinal barshaving cireumferential grooves in one end, a head vhaving a cani flaiigereeeivable in said vgrooves toshift said bars and' expand one endv of the'core when' said head is moved inwardly, a second head at theother'end of the'core, coaeting cam 4means `on 4said second headaiid said bars for shifting the' latterto expand said last named end of the eor'e when-said vsecond` headr 'is 'mvedfinwar'dlyfa rod secured to one head and passing slidably through the other head, means engaging said rod and said last na'medheadffor Inov` ing the two heads inwardly,va nd means associated 'with l said rodV for limiting the; movement of said heads away from each 'other to prevent disengagement of said cams means, and to prevent total reinoval of'said-i'iange from? said grooves'.

5. A holloweollapsible core comprising a plurality ofy longitudinal Vbars havingeircumferential grooves in oneend, .a head hav- "ing af cam flange vreceivable in s'aid grooves toshift said 'bars and expand one Iend of the core when said head is moved inwardly, a siecondhea'd at the` otherend of the core, coacting eam means-on said. second head and "said barsfoi said last named end of the core when said seeond head is moved inwardly, `a rodsecured to one head and passingslidably'through the :other head, said` rod having a'fslot, a

wedge for reception in said slot and en" gagement with said' ,last named head for moving the two heads inwardly toward-each other, iandmeans associated with said rod for limiting the movement of said heads away fromeach other toy ment of said"oam`i means, 3and to prevent total removal olwsaid 'langef'freniV said grooves. v

' 6.0.11 hollow; eol-lapsible-core'Comprising a prevent dis'fenga'ge''V yshifting the latter'v toleXpand plurality of longitiicl'inel bars, alternate bers slidably overlapping the intervening bai-rs, Canis on said bars, and :L head movable longitudinelly of Said bers and having Gains ooaeting with said first named Cenis to expand the core, ell of seid @eine being disposed.

ebliquely of the core exis and the e-uns essoeiatecl With said intervening bars being clisposed at :L greater angle to said axis than the other Cenis. 10

In testimony whereof I have hereunto Set iny hand.

Gopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

